Step 3Whisk milk and food color in small bowl. Blend in cocoa. Work chocolate mixture into one half of dough with wooden spoon until evenly blended. Divide both halves in half again to make 4 parts. Roll each between sheets of wax paper, coated with no-stick cooking spray, into 10 x 8-inch rectangles. Chill 15 minutes.

Step 4Heat oven to 375°F. Cut logs into 1/4-inch slices. Place on baking sheet. Sprinkle with sugar. Bake 5 to 7 minutes or until just lightly browned. Cool on baking sheet 2 minutes. Remove to wire rack to cool completely. To make sandwich cookies, spread frosting on bottom side of half the cookies. Top with another cookie, bottom side down, to form sandwich cookies.

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